JP2012502220A - Automobile fuel consumption calculation device and method - Google Patents

Abstract

An automobile fuel consumption calculation device and method are disclosed. The vehicle fuel consumption calculation device according to the present invention includes a travel distance calculation unit, an actual fuel consumption calculation unit, a travel distance calculated by the travel distance calculation unit, and an actual fuel consumption calculated by the actual fuel consumption calculation unit. A fuel consumption calculation unit that calculates fuel consumption based on the vehicle, a storage energy change calculation unit that calculates a change in vehicle storage energy including at least one of vehicle kinetic energy, vehicle positional energy, and vehicle electrical energy stored in the vehicle; A consumption energy calculation unit for calculating consumption energy when the vehicle storage energy is stored. In particular, the fuel consumption calculation unit calculates the storage energy fuel consumption by converting the storage energy change amount by the amount of fuel consumed by the engine, and calculates the consumption energy fuel consumption by converting the consumption energy by the amount of fuel consumed by the engine. The effective fuel consumption is calculated by subtracting the stored energy fuel consumption and the consumed energy fuel consumption from the actual fuel consumption, and the calculated effective fuel consumption is compared with the travel distance to calculate the fuel consumption. According to the present invention, it is possible to inform the driver of the relationship between the travel distance and the amount of fuel used, reflecting the operating conditions and the operating state of the electric device.

Description

  The present invention relates to an automobile fuel consumption calculation apparatus and method, and more specifically, fuel consumption efficiency of a fuel automobile having an engine that generates power using oxidation heat energy of fuel such as gasoline, light oil, LPG, ethanol, and hydrogen. It is related with the technique of calculating.

  A fuel vehicle basically includes an engine that generates power, a transmission device that transmits power generated from the engine to wheels, a power generation device coupled to the transmission device, and a battery coupled to the power generation device. . In this specification, the term fuel vehicle is used to include a hybrid vehicle that oxidizes hydrogen to generate heat.

  The engine generates heat by generating heat energy from the fuel and converting the heat energy into mechanical energy.

  The power generation device converts mechanical energy supplied from the transmission device into electric energy to charge the battery, or supplies electric power to each electric device installed in the automobile.

  The battery supplies power to an electrical device such as an emergency light or a window opening / closing device before the starting power of the automobile or the power generation device is activated, or when the output voltage of the power generation device is lower than the voltage of the battery.

  On the other hand, in the case of a fuel vehicle, the manufacturer uses the fuel consumption indicating the relationship between the fuel consumption and the mileage as one of the indexes indicating the performance of the vehicle as the driving environment (vehicle weight, wheel air pressure, driving speed, road surface). State, road complexity, wind speed, etc.).

  However, fuel efficiency measured under driving conditions of a certain condition is not suitable as a standard for judging whether or not a driver driving under a driving environment of various conditions is using fuel efficiently. In order to notify the fuel efficiency reflecting the actual driving environment conditions, an automobile fuel consumption calculation device that calculates the fuel consumption in real time has been devised and used.

  FIG. 5 is a functional block diagram of a conventional automobile fuel consumption calculation device.

  As shown in FIG. 5, a conventional automobile fuel consumption calculation device calculates a memory (not shown), a travel distance calculation unit 111 that calculates a travel distance and stores it in the memory, and calculates an amount of fuel consumed by the engine. The actual fuel consumption calculation unit 113 stored in the memory and the fuel consumption calculation unit 140 that calculates the fuel consumption by comparing the travel distance stored in the memory and the actual fuel consumption are included.

  The travel distance calculation unit 111 may be embodied to calculate the travel distance of the automobile by counting (in the case of digital input) or integrating (in the case of analog input) the input from the vehicle speed sensor 112.

  The actual fuel consumption calculation unit 113 converts the detected value from the water level sensor or the pressure sensor installed in the fuel tank, or converts the detected value from the flow sensor installed in the fuel injector to calculate the actual fuel consumption. Calculate the amount.

  The fuel supplied to the engine from the fuel tank is converted into mechanical energy via the engine output part, and then part of it is lost due to friction while driving the wheel, and part of the electric energy from the power generator. And disappears via the electric device of the automobile.

  Some of the mechanical energy converted at the engine output is stored in the form of kinetic energy of the car (increase in driving speed) or in the form of car potential energy (of car altitude) Increase), or stored in the form of electrical energy in the battery via a generator.

  On the other hand, if the fuel supply to the engine is interrupted while traveling, the vehicle will run somewhat further while the kinetic energy or potential energy stored in the vehicle is consumed.

  The fuel consumption calculation unit 140 calculates the fuel consumption of the travel distance / unit fuel form by dividing the travel distance of the car by the actual fuel consumption, or the fuel consumption / unit travel distance by dividing the actual fuel consumption by the travel distance of the car. It can be embodied to calculate the fuel consumption of the form.

  The fuel consumption calculated by the fuel consumption calculation unit 140 is displayed via a predetermined display unit 114 installed in front of the driver.

  However, according to the conventional automobile fuel consumption calculation device, it is considered that a part of the mechanical energy converted by the engine is stored as kinetic energy, potential energy or electric energy, and the stored energy can be further used. In order to calculate the fuel efficiency, the value decreases when the driver steps on the accelerator, and the value increases only when the driver releases the accelerator. And if the fuel supply to the engine is interrupted while traveling, the value becomes infinite (if the fuel supply to the engine is interrupted while traveling, the kinetic energy or potential energy stored in the automobile is consumed Will drive some more).

  As a result, it is impossible to inform the driver of the relationship between the distance traveled and the amount of fuel used, reflecting the operating conditions such as the driving speed of the automobile and the acceleration state of the automobile and the operating state of the automobile electric device such as an air conditioner. Will occur.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an automobile fuel consumption calculation device and method capable of calculating the relationship between the distance traveled and the amount of fuel used, reflecting the operating conditions or the operating state of the automobile electrical device. is there.

  In order to achieve the above object, according to an aspect of the present invention, a mileage calculation unit that calculates a mileage that a vehicle has moved during a predetermined mileage calculation period, and a start that is the same as the mileage calculation period An actual fuel consumption calculation unit that calculates the amount of fuel actually consumed by the engine during a fuel consumption calculation period that has a point and the same size, the travel distance calculated by the travel distance calculation unit, and the actual In a vehicle fuel consumption calculation device having a fuel consumption calculation unit for calculating fuel consumption based on the actual fuel consumption calculated by the fuel consumption calculation unit, an energy change amount calculation cycle having the same magnitude as the fuel consumption calculation cycle Vehicle kinetic energy stored in the vehicle during the period, vehicle potential energy stored in the vehicle during the energy conversion amount calculation cycle, and the energy change amount calculation cycle A storage energy change amount calculation unit that calculates a change amount of vehicle storage energy including at least one of the vehicle electrical energy stored in the battery; the fuel consumption calculation unit calculated by the storage energy change amount calculation unit The storage energy fuel consumption is calculated by converting the storage energy change amount by the amount of fuel consumed by the engine, and the storage energy fuel consumption is subtracted from the actual fuel consumption calculated by the actual fuel consumption calculation unit. There is provided an automobile fuel consumption calculation device that calculates an effective fuel consumption amount and calculates the fuel consumption by comparing the calculated effective fuel consumption amount with the travel distance calculated by the travel distance calculation unit.

  Here, in order to be able to inform the driver of the relationship between the travel distance and the fuel consumption more accurately, the energy change calculation cycle and the consumption energy calculation cycle having the same magnitude as the start point coincide with each other. A consumption energy calculation unit that calculates consumption energy when the vehicle storage energy is stored in between; the fuel consumption calculation unit uses the consumption energy calculated by the consumption energy calculation unit as fuel consumed by the engine A consumption energy fuel consumption amount calculated in terms of a quantity is calculated, and the effective fuel consumption amount is calculated by further subtracting the consumption energy fuel consumption amount from the actual fuel consumption amount calculated by the actual fuel consumption amount calculation unit. It is preferable to do.

  Mechanical energy storage efficiency indicating a ratio of mechanical energy of the wheel to mechanical energy of the engine output unit in a state where the power generation device is separated from the engine output unit so that the consumed energy can be easily calculated, and the engine output The electric power storage efficiency indicating the ratio of the battery charging electric energy to the mechanical energy of the engine output unit in a state where the power transmission system between the engine and the wheel is separated and the power generator is connected to the engine output unit is stored. The storage energy change amount calculating unit further stores the vehicle based on mechanical energy storage efficiency and electrical energy storage efficiency stored in the memory, and mechanical energy generated from the engine output unit in a running state. Calculating the amount of change in energy; Serial mechanics stored in the memory energy storage efficiency and electric energy storage efficiency, and the it is preferable that on the basis of the mechanical energy generated from the engine output unit configured to calculate the consumable energy in the running state.

  In addition, the energy change amount calculation cycle starts at the point where the power generated from the engine is converted into the vehicle storage energy so that the driver can be more accurately informed of the relationship between the travel distance and the fuel consumption. It is preferable that the fuel consumption calculation period is delayed by the storage time required for the storage.

  On the other hand, according to another aspect of the present invention, a mileage calculating step for calculating a mileage in which a vehicle has moved during a predetermined mileage calculation cycle, a starting point that is the same as the mileage calculation cycle, and a same magnitude An actual fuel consumption calculating step for calculating the amount of fuel actually consumed by the engine during a fuel consumption calculating period, a travel distance calculated in the travel distance calculating step, and an actual fuel consumption calculating step And a fuel consumption calculation step of calculating a fuel consumption based on the actual fuel consumption calculated in step (b), wherein the vehicle has an energy change amount calculation cycle having the same magnitude as the fuel consumption calculation cycle. Stored vehicle kinetic energy, vehicle potential energy stored in the vehicle during the energy change amount calculation cycle, and battery during the energy change amount calculation cycle A storage energy change amount calculating step of calculating a change amount of the vehicle storage energy including at least one of the vehicle electric energy stored in the storage; the fuel consumption calculating step includes the storage calculated in the storage energy change amount calculating step From the storage energy fuel consumption calculation step of calculating the storage energy fuel consumption by converting the amount of energy change by the amount of fuel consumed by the engine, and the actual fuel consumption calculated in the actual fuel consumption calculation step, An effective fuel consumption calculation step for calculating an effective fuel consumption by subtracting a storage energy fuel consumption calculated in a storage energy fuel consumption calculation step; an effective fuel consumption calculated in the effective fuel consumption calculation step; Comparing the mileage calculated in the mileage calculating step with the vehicle mileage calculation, To provide a method.

  Therefore, according to the present invention, the fuel consumption is calculated in consideration of the portion of mechanical energy converted by the engine that is stored as kinetic energy, potential energy, or electrical energy, so that the traveling speed of the vehicle or the acceleration of the vehicle is calculated. The driver can be informed of the relationship between the distance traveled and the amount of fuel used by reflecting the driving conditions such as the state and the operating state of the automobile electric device such as an air conditioner.

FIG. 1 is a functional block diagram of a vehicle fuel consumption calculating apparatus according to an embodiment of the present invention. FIG. 2 is a functional block diagram of the storage energy change amount calculation unit shown in FIG. FIG. 3 is a diagram showing the relationship of calculation cycles according to the embodiment of the present invention. FIG. 4 is a diagram illustrating a method for actually measuring storage efficiency according to an embodiment of the present invention. FIG. 5 is a functional block diagram of a conventional automobile fuel consumption calculation device.

  FIG. 1 is a functional block diagram of a vehicle fuel consumption calculating apparatus according to an embodiment of the present invention, FIG. 2 is a functional block diagram of a storage energy change amount calculation unit shown in FIG. 1, and FIG. 3 is according to an embodiment of the present invention. FIG. 4 is a diagram showing a relationship between calculation cycles, and FIG. 4 is a diagram showing a method for actually measuring storage efficiency according to an embodiment of the present invention.

  As shown in these drawings, the vehicle fuel consumption calculation apparatus according to the embodiment of the present invention includes a memory 15 and a travel distance calculation unit 11 that calculates a travel distance during the travel distance calculation period Pd and stores the travel distance in the memory 15. The actual fuel consumption amount calculation unit 13 that calculates the fuel amount actually consumed by the engine during the fuel consumption amount calculation period Pf and stores it in the memory 15, and the fuel consumption amount calculation period Ps stored in the vehicle during the energy change amount calculation period Ps. The storage energy change amount calculation unit 20 that calculates the change amount of the vehicle storage energy and stores it in the memory 15, and calculates the consumption energy required when the vehicle storage energy is stored between the consumption energy calculation periods Pw 1 and Pw 2. Consumable energy calculation unit 30 stored in memory 15, travel distance, actual fuel consumption, vehicle storage energy change amount and consumption energy stored in memory 15 And a fuel consumption calculating section 40 that calculates the fuel consumption based on chromatography.

  The memory 15 includes a travel distance calculation period Pd, a mechanical energy storage required time Td1, an electric energy storage required time Td2, a fuel amount energy conversion coefficient, a stored energy consumption energy conversion coefficient, and a rotational inertia of a part rotating on the transmission path. The moment is stored.

  The mileage calculation period Pd can be arbitrarily selected and stored in the memory 15 before leaving the car. In order to display the fuel consumption in real time, it is preferable to select the mileage calculation period Pd in a short time within one second.

  The mechanical energy storage time Td1 is a time required for mechanical energy generated from the engine to be transmitted to the wheels and stored as mechanical energy (kinetic energy and potential energy). It is actually measured and stored in the memory 15.

  The vehicle kinetic energy and the vehicle potential energy can be used as the same storage time because the energy transmission path is the same.

  The electric energy storage required time Td2 is the time required for mechanical energy generated from the engine to be transmitted to the battery and stored as vehicle electric energy, and is measured in advance and stored in the memory 15 before leaving the car. The

  These mechanical energy storage time Td1 and electrical energy storage time Td2 can be confirmed by engineering modeling or measurement experiments.

The fuel amount energy conversion coefficient is given by 1 / (K _o η _m ). Here, _Ko is energy generated when the unit fuel amount is burned or oxidized, and η _m is engine efficiency.

The storage energy consumption energy conversion coefficient is given by (1-η _k ) / η _k in the case of vehicle kinetic energy and vehicle potential energy, and is given by (1-η _e ) / η _e in the case of vehicle electrical energy. It is done. Here, η _k is the mechanical energy storage efficiency, and η _e is the electrical energy storage efficiency.

  The mechanical energy storage efficiency and the electrical energy storage efficiency are measured in advance by the following method and stored in the memory 15 before leaving the car.

The dynamic kinetic energy storage efficiency η _k can be measured by the following method (see FIG. 4).

  First, fuel is supplied to the engine with the vehicle power generation device removed.

  Thereafter, the mechanical energy A at the engine output unit and the mechanical energy B at the wheel are measured (product of rotational speed and torque).

  The mechanical energy A at the engine output portion includes mechanical energy A1 related to vehicle travel, mechanical energy A2 related to storage of vehicle kinetic energy, and mechanical energy A3 related to storage of vehicle position energy. Become sum.

  The mechanical energy B at the wheel is the sum of mechanical energy B1 related to vehicle travel, mechanical energy B2 related to storage of vehicle kinetic energy, and mechanical energy B3 related to storage of vehicle position energy. Become.

  Here, A1 → B1, A2 → B2, A3 → B3 are energy transmission paths (the engine output part and the wheel are the same, so B1 / A1 = B2 / A2 = B3 / A3 = B / A Become.

Therefore, η _k = B2 / A2 = B3 / A3 can be obtained by dividing the mechanical energy B at the wheel by the mechanical energy A at the engine output.

The electrical energy storage efficiency η _e can be measured by the following method (see FIG. 4).

  First, after separating the transmission from the clutch of the vehicle, the clutch is connected to the power generation device. Then, the battery is connected to the power generation device.

  Next, the mechanical energy C in the engine output unit and the electrical energy D in the battery are measured.

  The electrical energy in the battery can be measured using a voltmeter and an ammeter.

Finally, the electric energy storage efficiency η _e can be obtained by dividing the electric energy D in the battery by the mechanical energy C in the engine output.

  The rotational moment of inertia is measured or calculated for all parts rotating on the drive shaft prior to leaving the vehicle and stored in the memory 15.

  The travel distance calculation unit 11 is embodied to calculate the travel distance of the vehicle by counting (in the case of digital input) or integrating (in the case of analog input) the input from the vehicle speed sensor 12 during the travel distance calculation period Pd. be able to.

  The actual fuel consumption calculation unit 13 converts the detection value from the water level sensor or pressure sensor installed in the fuel tank during the fuel consumption calculation cycle Pf, or from the flow sensor installed in the fuel injector. The actual fuel consumption can be calculated by converting the detected value. The fuel consumption calculation cycle Pf has the same starting point and the same size as the travel distance calculation cycle Pd.

  The storage energy change amount calculation unit 20 is a travel vehicle mass calculation unit 21 that calculates the total mass of the travel vehicle, and a travel speed calculation unit that calculates the travel speed of the vehicle at the start and end points of the mechanical energy change amount calculation period Ps1. 22, an altitude change amount calculation unit 23 that calculates an altitude change amount of a running vehicle at the start point and end point of the mechanical energy change amount calculation cycle Ps 1, and a start point and an end point of the mechanical energy change amount calculation cycle Ps 1. A rotation angular velocity calculation unit 24 for calculating a rotation angular velocity for each component rotating on the transmission system, a battery power calculation unit 25 for calculating charge power and discharge power of the battery during an electric energy change amount calculation period Ps2, and an energy change A storage energy change amount calculation unit 26 that calculates a storage energy change amount between the amount calculation periods Ps1 and Ps2 is provided. Here, the mechanical energy change amount calculation period Ps1 has the same size as the fuel consumption amount calculation period Pf, and the starting point is delayed by the mechanical energy storage required time Td1. The electric energy change amount calculation period Ps2 has the same magnitude as the fuel consumption amount calculation period Pf, and the starting point is delayed by the electric energy storage required time Td2.

  The traveling vehicle mass calculation unit 21 can be implemented as follows when the suspension device is a coil spring. Two coil springs are installed between the front axle and the frame, and two coil springs are installed between the rear axle and the frame.

  First, a displacement sensor is installed in each coil spring to measure the deformation length of the coil spring. Next, the length change amount is calculated by subtracting the deformation length from the initial length of the coil spring, and the load change amount is calculated by multiplying the length change amount by the spring constant of the coil spring. When all the load changes calculated for the coil springs of each suspension device are combined, the total load change amount is obtained. After converting the unit by mass, this is added to the initial mass of the vehicle corresponding to the initial length of the coil spring. The total mass of the vehicle. Even when the suspension device is an elastic body of a type different from that of the coil spring, only the spring constant changes, so the same method can be applied.

  Of the inputs from the vehicle speed sensor 12, the traveling speed calculation unit 22 includes the start point vehicle speed value input from the vehicle speed sensor 12 at the start point of the mechanical energy change amount calculation period Ps 1, and the mechanical energy change amount calculation period Ps 1. The vehicle speed value input from the vehicle speed sensor 12 at the end point can be taken, and the running speed of the vehicle can be calculated at the start point and end point of the mechanical energy change amount calculation period Ps1.

  The altitude change amount calculation unit 23 can calculate the change amount of the vehicle altitude by installing an atmospheric pressure sensor or a tilt sensor on the vehicle body.

  The rotation angular velocity calculation unit 24 can calculate the rotation angle separately for the front end and the rear end of the clutch (or torque converter). There are a crankshaft, a camshaft, a flywheel and the like at the front end of the clutch, and a transmission gear, a propulsion shaft, a differential gear, an axle, a wheel and the like are arranged at the rear end of the clutch.

  The rotational angular velocity of a part arranged at the front end of the clutch (hereinafter referred to as “front end part”) can be calculated by the following method.

  First, the RPM of the engine is detected.

  Then, the rotational speed of the front end part is calculated by multiplying the engine RPM by the reduction ratio of the front end part.

  Next, the rotational angular velocity of the front end part is calculated by multiplying the rotational speed of the front end part by 2π.

  The rotational angular velocity of a part arranged at the rear end of the clutch (hereinafter referred to as “rear end part”) can be calculated by the following method.

  First, the vehicle speed is detected.

  Thereafter, the vehicle speed is divided by the travel distance per rotation of the wheel to calculate the rotation speed of the wheel.

  Next, the rotational speed of the rear end part is calculated by multiplying the rotational speed of the wheel by the reduction ratio of the rear end part.

  Thereafter, the rotational angular velocity of the rear end part is calculated by multiplying the rotational speed of the rear end part by 2π.

  The battery power calculation unit 25 can calculate the charging power and discharging power of the battery by the following method.

  First, a current sensor and a voltmeter are installed in the battery to detect the current value and current direction of the battery (current sensor), and the voltage value of the battery is detected (voltmeter).

  Next, the detected current value and the detected voltage value are integrated during the electric energy change amount calculation period Ps2.

  Thereafter, if the current direction of the current sensor is a direction input from the power generation device to the battery, it is determined as charging power, and if the current direction of the current sensor is the opposite direction, it is determined as discharging power.

  The storage energy change amount calculation unit 26 calculates the storage energy change amount between the energy change amount calculation periods Ps1 and Ps2 by the following method.

  First, the amount of change in vehicle kinetic energy during the mechanical energy change amount calculation period Ps1 is calculated by applying the following Equation 1.

Here, m is the total mass calculated by the traveling vehicle mass calculation unit, v ₁ and v ₂ are the vehicle speeds at the start point and end point of the mechanical energy change calculation period Ps ₁ detected by the vehicle speed sensor, respectively. _i is the rotational inertia moment of each front end part and rear end part stored in the memory 15, and ω _i1 and ω _i2 are the start point and end point of the mechanical energy change amount calculation period Ps1 of each front end part and rear end part, respectively. The rotational angular velocity at.

  Next, the change amount of the vehicle position energy during the mechanical energy change amount calculation period Ps1 is calculated by applying the following formula 2.

  Here, m is the total mass calculated by the traveling vehicle mass calculator, g is the gravitational acceleration, and Δh is the altitude change calculated by the altitude change calculator 23 during the mechanical energy change calculation period Ps1. It is.

  Next, the change amount of the vehicle electric energy during the electric energy change amount calculation period Ps2 is calculated by applying the following Equation 3.

Here, t1 and t2 are the start point and end point of the electric energy change amount calculation cycle Ps2, respectively, V _ei is the battery charge voltage, V _eo is the battery discharge voltage, and I _ei is the battery charge current, I _eo is the battery discharge current.

  Finally, the stored energy change amount is calculated by applying the following Equation 4.

  The consumption energy calculation unit 30 can calculate consumption energy during the consumption energy calculation periods Pw1 and P2w by the following method. Here, the consumption energy refers to energy applied when vehicle storage energy is stored. The mechanical consumption energy calculation period Pw1 has the same size as the fuel consumption calculation period Pf, and the starting point is delayed by the mechanical energy storage required time Td1. The electric consumption energy calculation cycle Pw2 has the same magnitude as the fuel consumption calculation cycle Pf, and the starting point is delayed by the electric energy storage required time Td2.

First, the consumed energy with respect to the change amount of the vehicle kinetic energy is calculated by multiplying the change amount of the vehicle kinetic energy and the change amount of the vehicle position energy calculated by the storage energy change amount calculation unit 20 by the storage energy consumption energy conversion coefficient (1-η _k ) / η _k. The consumption energy during the mechanical consumption energy calculation period Pw1 with respect to the energy and the vehicle position energy change amount is obtained.

Next, a storage energy consumption energy conversion factor (1-η _e ) / η _e is multiplied by the vehicle energy consumption change amount calculated by the storage energy change amount calculation unit 20 to calculate an electricity consumption energy calculation cycle Pw2 for the vehicle electric energy change amount. Find the consumed energy between.

  Finally, when the consumption energy with respect to the vehicle kinetic energy change amount, the consumption energy with respect to the vehicle position energy change amount, and the consumption energy with respect to the vehicle electrical energy change amount are summed, the consumption energy between the consumption energy calculation surroundings Pw1 and Pw2 can be obtained. it can.

  The fuel consumption calculation unit 40 includes a storage energy fuel consumption calculation unit 41 that calculates storage energy fuel consumption, a consumable energy fuel consumption calculation unit 42 that calculates consumption energy fuel consumption, and an effective fuel consumption calculation unit that calculates effective fuel consumption. A fuel consumption calculation unit 43 and a fuel consumption calculation unit 44 that calculates fuel consumption based on stored energy fuel consumption, consumed energy fuel consumption, and effective fuel consumption are provided.

The stored energy fuel consumption amount calculation unit 41 stores the storage energy change amount Es calculated by the storage energy change amount calculation unit 20 by multiplying the fuel amount energy conversion coefficient 1 / (K _o η _m ) stored in the memory 15. Calculate energy fuel consumption.

The consumption energy fuel consumption amount calculation unit 42 multiplies the consumption energy calculated by the consumption energy calculation unit 30 by the fuel amount energy conversion coefficient 1 / (K _o η _m ) stored in the memory 15 to obtain the consumption energy fuel consumption amount. calculate.

  The effective fuel consumption amount calculation unit 43 calculates the stored energy fuel consumption amount and the consumed energy fuel consumption amount calculation unit calculated by the stored energy fuel consumption amount calculation unit 41 from the actual fuel consumption amount calculated by the actual fuel consumption amount calculation unit 13. The effective fuel consumption is calculated by subtracting the energy consumption fuel consumption calculated in 42.

  As a result, the effective fuel consumption is smaller than the actual fuel consumption if the sum of the storage energy fuel consumption and the consumable energy fuel consumption is “plus”, and the effective fuel consumption is the storage energy fuel consumption. If the sum of energy consumption and fuel consumption is “minus”, the actual fuel consumption is greater.

  The fuel consumption calculation unit 44 calculates the fuel consumption of the travel distance / unit fuel form by dividing the travel distance calculated by the travel distance calculation unit 11 by the effective fuel consumption calculated by the effective fuel consumption calculation unit 43, or the effective fuel consumption. The fuel consumption / unit travel distance form may be calculated by dividing the amount by the travel distance.

  The fuel consumption calculated by the fuel consumption calculation unit 40 is displayed via a predetermined display unit 14 installed in front of the driver.

  As described above, according to the embodiment of the present invention, by calculating the fuel consumption in consideration of a portion stored as kinetic energy, potential energy, or electric energy among mechanical energy converted by the engine, The driver can be informed of the relationship between the distance traveled and the amount of fuel used by reflecting the driving conditions such as the driving speed and the acceleration state of the automobile and the operating state of the automobile electric device such as an air conditioner.

  By calculating the fuel consumption in consideration of the consumed energy when the vehicle storage energy is stored, it is possible to notify the driver of the relationship between the travel distance and the fuel consumption more accurately.

  In addition, the consumption energy can be easily calculated by calculating the consumption energy using the mechanical energy storage efficiency and the electrical energy storage efficiency that can be measured in advance.

  In addition, by selecting the energy change amount calculation cycle so as to be delayed from the fuel consumption calculation cycle by the required storage time until the power generated from the engine is converted into vehicle storage energy and stored, the mileage and fuel It is possible to inform the driver of the relationship with the usage amount more accurately.

Claims (4)

A mileage calculating unit for calculating a mileage traveled by the vehicle during a predetermined mileage calculating period, and an engine during a fuel consumption calculating period having the same starting point and the same size as the mileage calculating period. Fuel consumption based on the actual fuel consumption calculation unit for calculating the actual fuel consumption amount calculated in step 1, the travel distance calculated by the travel distance calculation unit, and the actual fuel consumption amount calculated by the actual fuel consumption calculation unit A fuel consumption calculation device having a fuel consumption calculation unit for calculating
Vehicle kinetic energy stored in the vehicle during the energy change amount calculation cycle having the same magnitude as the fuel consumption calculation cycle, vehicle potential energy stored in the vehicle during the energy conversion amount calculation cycle, and A storage energy change amount calculation unit that calculates a change amount of vehicle storage energy including at least one of vehicle electric energy stored in a battery during an energy change amount calculation cycle, and the energy change amount calculation cycle and a start point are A consumption energy calculation unit that calculates consumption energy when the vehicle storage energy is stored during a consumption energy calculation period that coincides and has the same magnitude;
The fuel consumption calculation unit calculates a storage energy fuel consumption amount obtained by converting the storage energy change amount calculated by the storage energy change amount calculation unit by a fuel amount consumed by the engine, and the consumption energy calculation unit calculates The consumption energy fuel consumption is calculated by converting the consumption energy by the amount of fuel consumed by the engine, and the stored energy fuel consumption and the consumption energy fuel are calculated from the actual fuel consumption calculated by the actual fuel consumption calculation unit. An effective fuel consumption is calculated by subtracting the consumption, and a fuel consumption is calculated by comparing the calculated effective fuel consumption with the travel distance calculated by the travel distance calculation unit. apparatus. The mechanical energy storage efficiency indicating the ratio of the mechanical energy of the wheel to the mechanical energy of the engine output unit in a state where the power generator is separated from the engine output unit, and the transmission system between the engine output unit and the wheel A memory storing electrical energy storage efficiency indicating a ratio of battery-charged electrical energy to mechanical energy of the engine output unit in a state where the power generation device is connected to the engine output unit;
The storage energy change amount calculation unit calculates a change amount of the vehicle storage energy based on mechanical energy storage efficiency and electric energy storage efficiency stored in the memory, and mechanical energy generated from the engine output unit in a running state. Calculate;
The consumption energy calculation unit calculates the consumption energy based on mechanical energy storage efficiency and electrical energy storage efficiency stored in the memory, and mechanical energy generated from the engine output unit in a running state. The vehicle fuel consumption calculation device according to claim 1.   In the energy change amount calculation cycle, the starting point is delayed from the fuel consumption calculation cycle by the time required for storage until the power generated from the engine is converted into the vehicle storage energy and stored. The vehicle fuel consumption calculation device according to claim 1. An engine between a mileage calculation stage for calculating a mileage traveled by the vehicle during a predetermined mileage calculation cycle, and a fuel consumption calculation cycle having the same starting point and the same size as the mileage calculation cycle Fuel consumption based on the actual fuel consumption calculation stage for calculating the actual fuel consumption in step 1, the travel distance calculated in the travel distance calculation stage, and the actual fuel consumption calculated in the actual fuel consumption calculation stage A fuel consumption calculation method having a fuel consumption calculation stage for calculating
Vehicle kinetic energy stored in a vehicle during an energy change calculation cycle having the same magnitude as the fuel consumption calculation cycle, vehicle potential energy stored in the vehicle during the energy change calculation cycle, and A storage energy change amount calculation step for calculating a change amount of vehicle storage energy including at least one of vehicle electric energy stored in a battery during an energy change amount calculation cycle, and the energy change amount calculation cycle and a starting point are A consumption energy calculation step for calculating consumption energy when the vehicle storage energy is stored during a consumption energy calculation period that coincides and has the same magnitude;
The fuel consumption calculation step includes a storage energy fuel consumption calculation step for calculating a storage energy fuel consumption amount obtained by converting the storage energy change amount calculated in the storage energy change amount calculation step by a fuel amount consumed by the engine; The consumption energy calculated in the consumption energy calculation step is calculated by the consumption energy fuel consumption calculation step for calculating the consumption energy fuel consumption by converting the consumption energy calculated by the amount of fuel consumed by the engine, and the actual fuel consumption calculation step. Calculate the effective fuel consumption from the actual fuel consumption by subtracting the storage energy fuel consumption calculated in the storage energy fuel consumption calculation step and the consumption energy fuel consumption calculated in the consumption energy fuel consumption calculation step. The effective fuel consumption calculation stage, and the effective fuel consumption calculated in the effective fuel consumption calculation stage Characterized in that it comprises a step of comparing the travel distance calculated by the amount and the travel distance calculating step, an automobile fuel consumption calculation method.

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